public class BNTree <E>{

        E data;
        BNTree lchild;
        BNTree rchild;

        public BNTree() {
            this.lchild = this.rchild = null;
        }

        public BNTree(E var1) {
            this.data = var1;
            this.lchild = this.rchild = null;
        }


}
